There was another long running interesting issue of one of my customers which I was able to fix today, where we were not able to open customized work items from team system web access and were getting the following error message:
Server: TFS 2012 Update 3
We found that customer had a very complicated work item types and JSON size of work item types exceeded the default value which is 20MB.
Hence, we advised them to increase JSON limit to something like 40MB using the following appSettings entry in web.config.
<add key="maxJsonLength" value="41943040" /> and that resolved the issue.
Written by: Nitish Nagpal, Support Escalation Engineer
Reviewed by: Serkan Inci, Product Group